Fluid type scraper holder

Abstract

The utility model belongs to the technical field of additive manufacturing, and relates to a fluid type scraper holder which comprises a scraper, a mounting rack and a fluid cover, the scraper is used for uniformly laying the powder material; the mounting frame is connected with the scraper and used for supporting and fixing the scraper; the fluid cover sleeves the periphery of the mounting frame, and the outer surface of the fluid cover is streamlined and is used for guiding airflow to flow along the outer surface of the fluid cover; the fluid cover is sleeved on the periphery of the scraper, and the outer surface of the fluid cover is streamlined, so that airflow can be conveniently guided to flow along the outer surface of the fluid cover in the high-speed moving process of the scraper, the air flowing resistance is reduced, and the pressure difference between the upper surface and the lower surface of a powder layer is further reduced; therefore, the scraper is prevented from rolling up the surface of the laid powder in the high-speed moving process, and the powder laying quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to additive manufacturing technical field, concretely relates to a fluid type scraper frame. BACKGROUND

[0002] As an important part of modern manufacturing industry, the core of additive manufacturing technology is to build objects with complex shape and structure through layer-by-layer material accumulation. Among the many technical paths of additive manufacturing, powder spreading printing technology is highly regarded for its high precision, high flexibility and wide material adaptability. The basic principle of powder spreading printing technology is to use a scraper frame to uniformly spread powder material on the printing platform under high-speed motion, and then use a laser beam or other heat source to selectively melt or sinter the powder, thereby building a three-dimensional object layer by layer.

[0003] There is some research on the structure of the scraper frame in the prior art. Referring to patent document No. 202010520208.1, an intelligent specified area quantitative powder spreading device and method are disclosed, which includes a powder scraping module and a powder falling module. The scraper is installed between the scraper frame and the scraper pressure plate. The scraper frame is connected to the scraper base plate, and the scraper base plate is connected to the linear motion module. The powder spreading roller is connected to the inner wall of the flange bearing. The baffle control shaft is connected to the inner wall of the ordinary deep groove ball bearing. The flow regulating baffle one is inserted into the slot in front of the powder supply bin. The flow regulating baffle one is connected to the powder supply bin. This device can quantitatively spread different amounts of powder in different specified rectangular areas.

[0004] As can be seen, through the synergistic effect of the powder scraping module and the powder falling module, combined with the precise control of the scraper frame and the linear motion module, the uniform distribution of the powder on the printing platform is ensured. However, the scraper usually performs powder spreading operations under high-speed motion. The air flow effect generated by the high-speed movement of the scraper frame can cause a pressure difference between the upper and lower surfaces of the powder layer, causing the spreaded powder particles to be easily rolled up, thereby destroying the uniformity and continuity of the powder layer. This unevenness of the powder layer can directly affect the precision of laser melting, resulting in shape deviation, size error and surface defects of the printed part, which seriously affects the quality of the printed part. UTILITY MODEL CONTENTS

[0005] To solve the technical problem that the air flow effect generated by the high-speed movement of the scraper frame can cause a pressure difference between the upper and lower surfaces of the powder layer, causing the spreaded powder particles to be easily rolled up in the background technology, the utility model provides a fluid type scraper frame.

[0006] The utility model fluid type scraper frame, through setting fluid cover in the scraper outer periphery, and the outer surface of fluid cover is set to streamline, in the high -speed movement process of scraper, it is convenient to guide airflow to flow along the outer surface of fluid cover, reduce air flow resistance, and then reduce the pressure difference between the upper and lower surfaces of powder layer, thereby prevent the scraper from rolling up the powder surface which has been laid in the high -speed movement process, improve powder laying quality.

[0007] To solve the above technical problems, the utility model provides the following technical scheme:

[0008] A fluid type scraper frame, including scraper, mounting frame and fluid cover, the scraper is used for uniform laying of powder material, the mounting frame is connected with the scraper, and is used for supporting and fixing the scraper, the fluid cover is sleeved on the outer periphery of the mounting frame, and is used for guiding airflow to flow along the outer surface of fluid cover.

[0009] In a specific embodiment, the outer surface of the fluid cover is set to a convex surface streamline, or a water droplet-shaped streamline, or a combination of upper convex curve and lower concave curve streamline, or an external concave curve streamline, or a two-side bullet-shaped streamline.

[0010] In a specific embodiment, the rear portion of the fluid cover is provided with a tail wing, and the bottom portion of the fluid cover is provided with a flow guide cover.

[0011] In a specific embodiment, the inside of the fluid cover is provided with an air duct, and the air duct penetrates through the fluid cover along the moving direction of the scraper.

[0012] In a specific embodiment, the fluid type scraper frame further comprises a guide mechanism and a driving mechanism; the guide mechanism is connected with the mounting frame, and is used for guiding the movement path of the mounting frame; the driving mechanism is connected with the mounting frame, and is used for driving the mounting frame to move along the extension direction of the guide mechanism.

[0013] In a specific embodiment, the guide mechanism comprises guide pieces arranged at both ends of the mounting frame, each of the guide pieces comprises a guide rail, a sliding block and a connecting piece; the guide rail extends along the powder scraping direction of the scraper, and the guide rail is provided with a sliding groove distributed along the length direction of the guide rail; the sliding block is clamped in the sliding groove, and the sliding block slides along the extension direction of the sliding groove; one end of the connecting piece is connected with the sliding block, and the other end is connected with the mounting frame.

[0014] In a specific embodiment, the connecting piece is connected with the sliding block, and the connecting surface of the connecting piece and the sliding block is horizontal.

[0015] In a specific embodiment, the connecting piece is connected with the sliding block, and the connecting surface of the connecting piece and the sliding block is vertical.

[0016] In one specific implementation, the driving mechanism is a belt drive, or a chain drive, or a synchronous belt drive, or a synchronous wheel drive, or a lead screw drive.

[0017] In one specific implementation, the mounting frame and the fluid cover are provided as an integrated structure.

[0018] In summary, the present application has the following beneficial technical effects:

[0019] 1. The fluid type scraper holder of the present application, by sleeving the fluid cover on the outer periphery of the scraper, and setting the outer surface of the fluid cover as a streamline type, facilitates the airflow to flow along the outer surface of the fluid cover during the high-speed movement of the scraper, reduces the air flow resistance, and further reduces the pressure difference between the upper and lower surfaces of the powder layer, thereby preventing the scraper from rolling up the powder surface that has been laid during the high-speed movement, and improving the powder laying quality.

[0020] 2. The fluid type scraper holder of the present application, the inside of the fluid cover is provided with an air duct, which optimizes the airflow path, further reduces the air flow resistance, reduces the pressure difference between the upper and lower surfaces of the powder layer, avoids the scraper from rolling up the powder on the powder surface, and improves the powder laying quality.

[0021] 3. The fluid type scraper holder of the present application, the mounting frame and the fluid cover are provided as an integrated structure, so that the overall structure of the fluid type scraper holder is compact. The operator directly connects the mounting frame with the guide mechanism, which realizes the position fixation of the scraper, does not need additional fasteners such as screws and positioning pins, reduces the risk of failure caused by loosening or damage of the fasteners, and improves the working reliability of the fluid type scraper holder. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the overall structure schematic diagram of the fluid type scraper holder of the present application.

[0023] Figure 2 is the overall structure schematic diagram of the fluid type scraper holder of the present application, which aims to show the connecting piece.

[0024] Figure 3 is the sectional view of the fluid type scraper holder of the present application, which aims to show the scraper, the scraper holder and the fluid cover.

[0025] Figure 4 is the local structure schematic diagram of the fluid type scraper holder of the present application, which aims to show the external contour of the fluid cover.

[0026] Figure 5 is the local structure schematic diagram of the fluid type scraper holder of the present application, which aims to show the internal structure of the fluid cover.

[0027] Figure 6It is a partial structure schematic view of embodiment 1 of the fluid type scraper frame.

[0028] Figure 7 It is a partial structure schematic view of embodiment 2 of the fluid type scraper frame, and aims at showing the fluid cover with the convex curved surface external surface.

[0029] Figure 8 It is a partial structure schematic view of embodiment 3 of the fluid type scraper frame, and aims at showing the fluid cover with the water drop shaped external surface.

[0030] Figure 9 It is a partial structure schematic view of embodiment 4 of the fluid type scraper frame, and aims at showing the fluid cover with the upper convex curve and lower concave curve external surface.

[0031] Figure 10 It is a partial structure schematic view of embodiment 6 of the fluid type scraper frame, and aims at showing the fluid cover with the two side bullet head external surface.

[0032] Figure 11 It is a partial structure schematic view of embodiment 7 of the fluid type scraper frame.

[0033] Figure 12 It is a whole structure schematic view of embodiment 8 of the fluid type scraper frame.

[0034] Figure 13 It is a whole structure schematic view of embodiment 8 of the fluid type scraper frame.

[0035] Mark explanation: 1, scraper; 2, mounting frame; 3, fluid cover; 31, air duct; 32, tail wing; 33, flow guide cover; 4, guide; 41, guide rail; 42, sliding block; 43, connecting piece. Specific implementation

[0036] The technical scheme of the utility model will be further explained and described below in combination with the drawings and embodiments, but the utility model is not limited to the following described embodiments.

[0037] In the powder laying process, after the powder material is placed on the printing platform, the powder material is laid uniformly using the scraper 1, and during the powder laying process, the scraper 1 is usually in a high-speed motion state with a speed greater than or equal to 300 mm / s. When the scraper 1 is in a high-speed motion state, the air flow effect generated by the high-speed movement of the mounting frame 2 can cause a pressure difference between the upper and lower surfaces of the powder layer, so that the spreaded powder particles are subjected to an upward pulling force and are easy to roll up, thereby destroying the uniformity and continuity of the powder layer. Such unevenness of the powder layer directly affects the precision of laser melting, causing shape deviation, size error and surface defects of the printed part, and seriously affecting the quality of the printed part. The utility model aims to provide a fluid type scraper frame, which is provided with a fluid cover 3 around the scraper 1, so that the air flow is guided to flow along the outer surface of the fluid cover 3 during the high-speed movement of the scraper 1, thereby reducing the pressure difference between the upper and lower surfaces of the powder layer, preventing the spreaded powder surface from being rolled up during the high-speed movement of the scraper 1, and improving the powder laying quality.

[0038] Referring to Figures 1-5 A fluid type scraper frame, comprising: a scraper 1, a mounting frame 2, a fluid cover 3, a guide mechanism and a driving mechanism; the scraper 1 is used for uniformly laying powder material; the mounting frame 2 is connected with the scraper 1 and is used for supporting and fixing the scraper 1; the fluid cover 3 is sleeved on the outer periphery of the mounting frame 2 and the outer surface is provided with a streamline shape, which is used for guiding the air flow to flow along the outer surface of the fluid cover 3; the guide mechanism is connected with the mounting frame 2 and is used for guiding the movement path of the mounting frame 2; the driving mechanism is connected with the mounting frame 2 and is used for driving the mounting frame 2 to move along the extension direction of the guide mechanism.

[0039] Specifically, the scraper 1 is fixedly connected with the mounting frame 2 through screws, so as to move synchronously with the mounting frame 2.

[0040] Specifically, the outer surface of the fluid cover 3 can be provided with a convex curved surface streamline shape, or a water drop shaped streamline shape, or a combination of a convex curve at the upper part and a concave curve at the lower part, or an external concave curve, or a two-sided bullet head streamline shape; by setting the outer surface of the fluid cover 3 to be a suitable streamline shape, the air flow is guided to flow along the outer surface of the fluid cover 3, and such setting modes can effectively guide the air flow and reduce the pressure difference between the upper and lower surfaces of the powder layer.

[0041] Referring to Figure 4 And Figure 5 The inside of the fluid cover 3 is provided with an air duct 31 which penetrates through the fluid cover 3 along the moving direction of the scraper 1, so as to optimize the flow path of the air flow and reduce the air flow resistance.

[0042] Preferably, a plurality of air ducts 31 are arranged side by side along the height direction of the fluid cover 3; the specific number of air ducts 31 can be one, two, three, and a proper number of air ducts 31 is arranged according to the moving speed of the scraper to further reduce the air flow resistance and optimize the air flow path; such arrangement is also acceptable. In the present application, one air duct 31 is arranged in the fluid cover 3.

[0043] With reference to Figure 1 and Figure 2 , the guide mechanism includes guide pieces 4 arranged at both ends of the mounting frame 2, each guide piece 4 including a guide rail 41, a sliding block 42, and a connecting piece 43. The guide rail 41 extends along the powder scraping direction of the scraper 1, and the surface of the guide rail 41 is provided with a sliding groove distributed along the length direction of the guide rail 41; the sliding block 42 is clamped in the sliding groove and slides along the extension direction of the sliding groove; the connecting piece 43 is fixedly connected at one end to the sliding block 42 and at the other end to the mounting frame 2, thereby ensuring that the mounting frame 2 can stably move along the extension direction of the guide rail 41. The connecting piece 43 is connected to the sliding block 42, and the connecting surface of the connecting piece 43 and the sliding block 42 is horizontal. Specifically, the connecting surfaces of the two connecting pieces 43 at both ends of the mounting frame 2 and the sliding block 42 are vertical, so that the powder scraping path of the scraper 1 remains horizontal, thereby ensuring the uniformity of the powder layer.

[0044] The driving mechanism can be a belt drive, a chain drive, a synchronous belt drive, a synchronous wheel drive, or a lead screw drive. Preferably, the driving mechanism is a lead screw drive, which has high precision, high stability, and is easy to control; specifically, the lead screw drive includes a lead screw, a nut, and a driving motor. The output end of the driving motor is coaxially connected to the lead screw, the nut is threadedly connected to the lead screw, and the nut is fixedly connected to the mounting frame 2; specifically, the driving motor drives the lead screw to rotate, thereby driving the nut and the mounting frame 2 connected to the nut to move along the axial direction of the lead screw, achieving precise control of the moving direction of the scraper 1.

[0045] For the driving modes of the belt drive, the chain drive, the synchronous belt drive, and the synchronous wheel drive, the specific structure can be designed and implemented according to existing technologies, and the setting principle is a basic principle known to those skilled in the art, which will not be described here.

[0046] Embodiment 1:

[0047] With reference to Figure 6 , the fluid-type scraper holder is provided with a streamlined air duct 31 in the fluid cover 3.

[0048] In this embodiment, the air duct 31 in the fluid cover 3 is streamlined, which facilitates further optimization of the air flow path and reduction of the air flow resistance, thereby further reducing the pressure difference between the upper and lower surfaces of the powder layer.

[0049] Embodiment 2:

[0050] Referring to Figure 7 In this embodiment, the outer surface of the fluid cover 3 is set as a convex curved surface streamline type, so that the air flows smoothly along the convex curved surface when passing through the fluid cover 3, reducing the turbulence and vortex of the air flow, thereby reducing the direct impact and interference of the air flow on the powder layer.

[0051] In this embodiment, the outer surface of the fluid cover 3 is set as a convex curved surface streamline type, so that the air flows smoothly along the convex curved surface when passing through the fluid cover 3, reducing the turbulence and vortex of the air flow, thereby reducing the direct impact and interference of the air flow on the powder layer.

[0052] Embodiment 3:

[0053] Referring to Figure 8 In this embodiment, the outer surface of the fluid cover 3 is set as a water droplet-shaped streamline type.

[0054] In this embodiment, the outer surface of the fluid cover 3 is set as a water droplet-shaped streamline type. Specifically, from the starting end of the air flow moving along the fluid cover 3 to the end, the outer contour of the fluid cover gradually shrinks, finally forming a sharp point at the end, forming a smooth and smooth transition, reducing the resistance and turbulence of the air flow, thereby reducing the pressure difference between the upper and lower surfaces of the powder layer, and at the same time, improving the stability and uniformity of the air flow, thereby improving the powder laying quality.

[0055] Embodiment 4:

[0056] Referring to Figure 9 In this embodiment, the outer surface of the fluid cover 3 is set as a combination of upper convex curve and lower concave curve streamline type.

[0057] In this embodiment, the outer surface of the fluid cover 3 is set as a combination of upper convex curve and lower concave curve streamline type, the upper convex curve guides the air flow to flow upward, forming a relatively stable upper air flow layer; the lower concave curve guides the air flow to flow downward, forming a relatively stable lower air flow layer, which further stabilizes the powder layer and improves the uniformity and continuity of the powder laying through the interaction of the upper and lower air flows.

[0058] Embodiment 5:

[0059] In this embodiment, the outer surface of the fluid cover 3 is set as a convex curved surface streamline type, so that the air flows smoothly along the convex curved surface when passing through the fluid cover 3, reducing the turbulence and vortex of the air flow, thereby reducing the direct impact and interference of the air flow on the powder layer.

[0060] In this embodiment, the outer surface of the fluid cover 3 is set as a convex curved surface streamline type, so that the air flows smoothly along the convex curved surface when passing through the fluid cover 3, reducing the turbulence and vortex of the air flow, thereby reducing the direct impact and interference of the air flow on the powder layer.

[0061] Embodiment 6:

[0062] With reference to Figure 10 , the outer surface of the fluid cover 3 is provided with a streamlined bullet shape on both sides.

[0063] In this embodiment, the outer surface of the fluid cover 3 is provided with a streamlined bullet shape on both sides, and the bullet shape forms two sharp points at both ends of the fluid cover 3. The two ends of the fluid cover 3 guide the airflow like an arrow in a predetermined direction, further reducing the resistance and turbulence of the airflow, and thereby reducing the pressure difference between the upper and lower surfaces of the powder layer.

[0064] Embodiment 7:

[0065] With reference to Figure 11 , the fluid scraper frame of this embodiment is provided with a tail fin 32 at the rear of the fluid cover 3, and a flow guide cover 33 at the bottom of the fluid cover 3. Among them, the rear of the fluid cover 3 refers to the tail end of the airflow moving along the fluid cover 3.

[0066] In this embodiment, the tail fin 32 generates additional lift and stability, making the fluid cover 3 more stable and smooth when moving at high speed, improving the overall performance of the scraper frame and user experience. The flow guide cover 33 is further arranged to guide the airflow to flow in a predetermined direction, and to reduce the direct impact and interference of the airflow on the powder layer, thereby improving the powder laying quality.

[0067] Embodiment 8:

[0068] With reference to Figure 12 and 13 , the fluid scraper frame of this embodiment is provided with a connecting piece 43 connected to the sliding block 42, and the connecting surface of the connecting piece 43 and the sliding block 42 is vertical.

[0069] Specifically, one connecting piece 43 is connected to the sliding block 42 in a vertical direction, and the other connecting piece 43 is connected to the sliding block 42 in a horizontal direction, so that the powder scraping path of the scraper 1 is inclined to adapt to different working environments.

[0070] In this embodiment, in actual application, due to the limitation of working space or the specific placement requirement of the guide rail 41, the connecting part of the mounting frame 2 and the guide rail 41 needs to be adjusted accordingly. By setting the connecting surface of the connecting piece 43 and the sliding block 42 in two different directions, the mounting frame 2 can meet different working scenes and ensure that the scraper 1 always remains stable and smooth during movement.

[0071] Embodiment 9:

[0072] With reference to Figure 1 and Figure 2The mounting frame 2 and the fluid cover 3 are arranged in an integrated structure.

[0073] In the embodiment, the mounting frame 2 and the fluid cover 3 are arranged in an integrated structure, so that the overall structure of the fluid-type scraper frame is compact.

[0074] Embodiment 10:

[0075] With reference to Figure 5 In the embodiment, the mounting frame 2 and the fluid cover 3 are arranged in an integrated structure, so that the overall structure of the fluid-type scraper frame is compact.

[0076] In the embodiment, the mounting frame 2 and the fluid cover 3 are arranged in an integrated structure, so that the overall structure of the fluid-type scraper frame is compact.

[0077] The working principle of the fluid-type scraper frame is as follows: in the printing process, the driving mechanism is started, the driving mechanism drives the mounting frame 2 to move along the extension direction of the guide rail 41, the mounting frame 2 drives the sliding block 42 and the scraper 1 to move synchronously, and the scraper 1 sweeps and lays the powder material on the printing platform in the high-speed moving process; in the high-speed moving process of the scraper 1, the fluid cover 3 guides the airflow to flow along the outer surface of the fluid cover 3, reduces the air flow resistance, and further reduces the pressure difference between the upper and lower surfaces of the powder layer, prevents the scraper 1 from rolling up the laid powder surface in the high-speed moving process, and improves the powder laying quality.

[0078] The preferred embodiments of the utility model are not limited to the protection scope of the utility model, and therefore: any equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A fluid squeegee carrier, characterized by, The utility model relates to a fluid type scraper frame, which comprises the following parts: a scraper (1) for uniformly laying powder material; a mounting frame (2) connected with the scraper (1) for supporting and fixing the scraper (1); and a fluid cover (3) sleeved on the outer periphery of the mounting frame (2) and provided with a streamlined outer surface for guiding airflow to flow along the outer surface of the fluid cover (3).

2. The fluid squeegee carrier of claim 1, wherein: The outer surface of the fluid cover (3) is provided with a convex curved surface streamline, or a water drop streamline, or a streamline combination of a convex curve at the upper part and a concave curve at the lower part, or an external concave curve streamline, or a two-side bullet streamline.

3. The fluid squeegee carrier of claim 1, wherein: The rear part of the fluid cover (3) is provided with a tail wing (32), and the bottom part of the fluid cover (3) is provided with a flow guide cover (33).

4. Fluid knife holder according to any one of claims 1-3, characterized in that: The inside of the fluid cover (3) is provided with an air duct (31) penetrating through the fluid cover (3) along the moving direction of the scraper (1).

5. The fluid squeegee carrier of claim 4, wherein: The fluid type scraper frame further comprises a guiding mechanism and a driving mechanism; the guiding mechanism is connected with the mounting frame (2) for guiding the movement path of the mounting frame (2); the driving mechanism is connected with the mounting frame (2) for driving the mounting frame (2) to move along the extension direction of the guiding mechanism.

6. The fluid squeegee carrier of claim 5, wherein: The guiding mechanism comprises guiding members (4) arranged at both ends of the mounting frame (2), and each guiding member (4) comprises a guide rail (41), a sliding block (42) and a connecting member (43); the guide rail (41) extends along the powder laying direction of the scraper (1), and the surface of the guide rail (41) is provided with sliding grooves distributed along the length direction of the guide rail (41); the sliding block (42) is clamped in the sliding grooves, and the sliding block (42) slides along the extension direction of the sliding grooves; the connecting member (43) is connected with the sliding block (42) at one end and connected with the mounting frame (2) at the other end.

7. The fluid squeegee carrier of claim 6, wherein: The connecting member (43) is connected with the sliding block (42), and the connecting surface of the connecting member (43) and the sliding block (42) is horizontal.

8. The fluid squeegee carrier of claim 6, wherein: The connecting member (43) is connected with the sliding block (42), and the connecting surface of the connecting member (43) and the sliding block (42) is vertical.

9. The fluid squeegee carrier of claim 5, wherein: The driving mechanism is a belt transmission member, a chain transmission member, a synchronous belt transmission member, a synchronous wheel transmission member or a lead screw transmission member.

10. The fluid squeegee carrier of claim 1, wherein: The mounting frame (2) and the fluid cover (3) are provided in an integrated structure.

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